Would like to add an updated cover > Likes and Comments

I would like to update the cover to my book Sacrifice and the book Grace. I read the instructions for uploading covers for new editions, however I am confused as to how to provide a link to a non book selling site if my book is only available from Amazon.
Thank you

The instructions say that Amazon is an acceptable source.
Note that we only update covers for Kindle and Audible editions, for other formats if ISBN remains the same you can add an alternate cover edition